Reader::readLong PHP Метод

    public function readLong()
    {
        $tag = $this->stream->getc();
        switch ($tag) {
            case '0':
                return '0';
            case '1':
                return '1';
            case '2':
                return '2';
            case '3':
                return '3';
            case '4':
                return '4';
            case '5':
                return '5';
            case '6':
                return '6';
            case '7':
                return '7';
            case '8':
                return '8';
            case '9':
                return '9';
            case Tags::TagInteger:
            case Tags::TagLong:
                return $this->readLongWithoutTag();
            default:
                throw $this->unexpectedTag($tag);
        }
    }